|Publication number||US5361397 A|
|Application number||US 08/123,600|
|Publication date||Nov 1, 1994|
|Filing date||Sep 20, 1993|
|Priority date||Aug 26, 1991|
|Publication number||08123600, 123600, US 5361397 A, US 5361397A, US-A-5361397, US5361397 A, US5361397A|
|Inventors||James A. Wright|
|Original Assignee||Motorola, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (11), Referenced by (132), Classifications (15), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This is a continuation of application Ser. No. 07/749,811, filed Aug. 26, 1991, now abandoned.
This invention relates generally to communication systems and more specifically to radio communication systems.
In present day communication systems such as paging systems, portable electronic mail (E-mail) systems, roaming computer networks, and the other similar communication systems which utilize portable wireless battery operated receivers, the issue of extending battery life becomes very important. The techniques employed in the art for extending the battery life of these portable receivers are numerous and include manually or automatically turning off certain circuits in the portable communication devices (such as portions of the portable communication device's receiver section) for certain predetermined periods of time.
A couple of prior battery saving techniques include U.S. Pat. No. 4,860,005- Deluca et al. (1985) which teaches the automatic turn on/off of a communication receiver by utilizing a real-time clock which is programmed to turn on/off at preset periods of time. Another prior battery saving technique is disclosed in U.S. Pat. No. 4,398,192- Moore et al. (1983). Moore et al, provides for battery saving for a pager by transmitting the address code assigned to a particular pager a predetermined interval of time following a sync signal, thus the pager can be powered-down until the approximate time period in which its address code would be transmitted.
Unfortunately, although these battery saving techniques increase the battery life of the communication devices, they pose a major problem for systems which need to send network or system update information to all of the devices operating in the communication system. The same communication device access problem occurs to communications units which have been turned off by their users, thereby causing the units to miss important system update information.
A need exists in the art for a way of guaranteeing the delivery of system messages to communication devices which are either in a battery saving mode or which have been powered down by their users.
Briefly described, the present invention contemplates a communication device capable of automatically energizing (turning on) even if the communication device is presently off or in a battery saving (low power) condition in order to guarantee the reception of important system information messages.
According to the invention, a communication device capable of operating in a communication system having a control station which transmits information signals that include system time codes to the communication device is described. The communication device being capable of operating in a first high power consumption mode and in a second low power consumption mode. The communication device comprises, a receiver means for receiving information signals from the control station and a decoder means responsive to the receiver means for decoding the system time code from the information message. The communication device 200 further comprises a storage means for storing the system time code and a timer means for measuring an interval of time. Finally, the communication device includes a controller means responsive to the timer means for modifying the system time code and for making the communication device operate for a predetermined period of time in the first high power consumption mode upon the system time code reaching a predetermined value.
In another aspect of the present invention a method of automatically energizing a communication device is described.
In still another aspect of the present invention a communication system capable of automatically energizing communication devices operating within the communication system is described.
FIG. 1 is a diagram of a communication system in accordance with the present invention.
FIG. 2 is a block diagram of a communication device in accordance with the present invention.
FIG. 3 is a flow diagram illustrating a typical operating sequence in accordance with the present invention.
Referring to the drawings and more specifically to FIG. 1, there is shown a communication system 100 in accordance with the present invention. Communication system 100 for the purposes of the following description can be any type of radio communication system, but more specifically, for the purposes of this description, system 100 will be a paging system as known in the art. Paging system 100 includes a central control station or terminal 104 which sends information to pagers 106 and 108 over service (coverage) area 102. Voice or data is selectively transmitted from base 104 to any of the pagers 106 or 108 operating in system 100. Control station 104 comprises a computer system as known in the art, with appropriate memory and input capabilities that are coupled to a communication transmitter in order to transmit information messages to the individual communication devices (106 and 108).
Once the voice or data is received by the pager, the information is decoded and the decoded message is either displayed, in the case of data, or annunciated over the pager's speaker, in the case of a voice message. Pagers in groups 106 and 108 each have different individual pager identification numbers (ID's) which are used to selectively address each of the pagers individually, plus they also have group ID's in order for the paging terminal 104 to address them as a group (either group 106 or 108).
In present day paging systems such as those used to transmit E-mail, it becomes very important for the paging terminal 104 to be able to transmit information to all, a select group, or an individual communication unit in the system 100 at any given time (106 and 108). These transmissions can include information such as systems news, general information messages to all users, information to update the operating systems of the communication units (e.g. over-the-air programming), etc. Unfortunately, it becomes almost impossible to guarantee that all units will be able to receive the messages sent by the paging terminal 104 since some of the units (106 and 108) may be in battery saver mode (low power mode), which can include having their receivers turned off, or the communication units may be completely turned off at the time the paging terminal 104 wants to transmit the message.
The present invention provides for a simple, but yet very effective way, of guaranteeing that communication units will be operational at the time that important system information is to be transmitted. The invention assures that all units using system 100 will be in a position to receive system messages whenever the system chooses to send them (paging terminal 104). In a typical system, this would probably occur once a day during a time period when the systems normal traffic load is at a minimum. Because these times are unknown and subject to change, it is imperative that the system 100 can control the "wake up" period of each of the units (106 and 108) automatically.
A single system 100 may have a number of "service groups", such as groups 106 or 108, each of which the paging terminal 104 may desire to send specific service group messages at different times. This necessitates the ability to allow for multiple automatic "turn on" of different groups of communication device groups at different times. For example, one group of communication devices 106 may receive a system update at one specific time, while other units 108 may receive a system update at another time. The present invention accomplishes this by the use of a system time code (hereinafter referred to as "STC") which directs the action of each of the communication units using the network. The STC is transmitted by the paging terminal 104 to all devices on the system 100, either all at once, or selected groups of devices 106 or 108 at different times, or individually. The STC is preferably appended to standard system messages transmitted by paging terminal 104. Paging terminal 104 determines the value of the STC transmitted to each of the pagers (106 and 108) and constantly modifies the value of the STC on a real time basis. This allows all of the pagers (106 and 108) to become synchronized with paging terminal 104 since their STC values should be the same at any given period of time. All of the pagers (106 and 108) will beginning decrementing the STC value as soon as it is received, in order to reach the point at which the STC reaches zero, indicating that it is time for the pager to turn on.
In FIG. 2, a block diagram of a radio communication device 200 in accordance with the present invention is shown. Communication device 200 is similar to communication devices 106 and 108 of FIG. 1. The communication device 200 comprises a control means such as controller 202 which controls the overall operations of device 200. Controller 202 can be a microprocessor or microcontroller as known in the art. Controller 202 is also responsible for switching communication device 200 from a high power consumption mode (all of the communication device's circuits being operational) to a low power consumption mode (battery saving mode). The low power consumption mode is used to conserve battery life and can include the turning off of certain circuits in the communication device 200 as known in the art under the control of controller 202. Preferably, controller 202 disables receiver 204 and certain other circuits found in device 200 while operating in the low power consumption mode. This allows lower power consumption for device 200 thereby extending the device's battery life.
Coupled to the control means 202 is a storage means in the form of conventional memory which can include ROM, EEPROM, RAM, etc. It is in the storage means 212 where a system time register (hereinafter referred to as "STR") is located. It is in the STR where the system time code (STC) is stored, once the STC is received from paging terminal 104. Communication device 200 also includes a conventional receiver 204 which is utilized for selectively receiving the radio frequency (RF) signals which are gathered by antenna 216. A timer means 222 such as a real time clock as known in the art, or a precision oscillator circuit is also found coupled to controller 202. Timer means 222 allows for the synchronization of all the units in system 100. Timer means 220 is preferably a precision time keeping unit which can remain accurate while still operating in different environmental conditions which communication unit 200 might be exposed to during normal operation.
Communication unit 200 further includes a display 208 for displaying received information which is decoded by controller 202. A set of annunciators 206 such as LED's and a speaker are also part of communication device 200, as well as other user controls 210 such as an on/off switch, volume control, etc. Optionally, communication device 200 can include a conventional transmitter 220 and antenna switch 214 in the case that communication device 200 is a transceiver unit such as a portable radio. A standard microphone 218 can be coupled to transmitter 220 so that voice message can be transmitted.
Upon reception of a message by receiver 204 from paging terminal 104, the system time code (STC) is "stripped off" (decoded) from the received message by the control means 202 which uses a decoder means such as a conventional software program to decode the incoming information (in the case the message contains a STC). The controller 202, then stores the STC in the system time register (STR), located in storage means 212. Preferably, the STR register is decremented (value of STC is decremented) each time that the device's real time clock 222 increments in time. Those skilled in the art will realize that the STR can be decremented after any period of time has elapsed, for example the STR can be decremented every 10 seconds of elapsed time, every second, etc. The amount of time elapsed in the timer means 222 per each decrement of the STR can be programmable and be changed by paging terminal 104.
The STC word can be any length, for example the STC could be a 8 bit binary code word. The longer the STC, the longer will the message transmitted by paging terminal 104 become, since the STC is preferably appended to the message being transmitted by terminal 104. The longer the STC code word and the shorter the amount of time elapsed in the timer means 220 per decrement of the STC, the greater will be the accuracy with which the communication units (106 and 108) will automatically energize.
The length of time the communication device (106 and 108) stays energized (turned on if previously in battery saver mode, or if previously turned off) can be for the length of the present system message, or for a predetermined period of time that can be either be sent over the air in the message itself, or a period of time which had been stored previously in storage means 212 (sent along with the STC).
Referring now to FIG. 3, a typical sequence of operation of the present invention will be presented. The sequence shown in FIG. 3 starts with the communication device having a STC already stored in memory 212 in the system time register (STR). In step 302, the control means 202 determines if the device timer (or real time clock, "RTC") has incremented in time, this can be determined by an output port coming from the timer 222 which "pulses" every time the timer 222 is incremented, or in the case of a real time clock the control means 202 can compare the exact time (Hours, Minutes, Seconds, Fractions of seconds, etc) with a previously stored time, to determine if the necessary period of time has elapsed in order to decrement the STC. If the timer means 222 has not incremented the necessary period of time, the routine repeats step 302, while if the timer has incremented the necessary period of time, the routine moves on to step 304.
In step 304, the system time code ("STC") is decremented, with the amount that the STC is decremented per each increment of the RTC controlled by the resolution level previously discussed. For example, the system time code can be decremented every second, or every hour, all depending on the resolution that one wants to attain. In decision step 306, it is then determined if the STR equals zero (STC has reached zero), if the STR has not yet reached zero, the routine returns to step 302. If the STR has reached zero, in step 308, the communication device 200 is turned on ("energized") so that the system message that will be sent by paging terminal 104 may be received, even if the device 200 was previously turned off or in a battery saving mode, thereby guaranteeing that all devices within range of system 100 (in coverage area 102) are capable of receiving the message being sent by paging terminal 104.
In decision step 31 0, it is then determined if the system update message has been received, if no message has been received, the routine keeps waiting until a message is received from control terminal 104. Once the system message has been received, which can be determined by the use of an end of message flag or other well known methods of indicating the termination of a message, in step 312, the new incoming system time code ("STC") is stripped off the new system message. Then in step 314, the new STC is stored in the system time register ("STR") in order to once again synchronize the communication device 200 and the paging terminal 104.
To assure that the communication devices 106 and 108 are "synchronized" to the system time clock (STC), it would be preferred, but not mandatory, to include the current STC value in each individual message received by a device user. For example, after each message (page) to that individual communication unit (106 or 108), the STC would be updated by the paging terminal 104 continuously on a per system, per group, or per individual radio if so desired. Any time a message is directed to a pager (such as pagers 106 or 108) the paging terminal can send the updated STC value in order to guarantee that the communication unit and paging terminal 104 are synchronized in time. Since present day timing means 222 such as real time clocks are very accurate, it would be possible to only have to upgrade the STC once a day or less.
In order to guarantee that a communication device does not lose synchronization with the system 100, each communication device (106 and 108) can have stored in the device itself a default turn on code word, that would be continuously decremented, and would turn on the device if the device does not receive a system message or STC update within a given period of time. For example, the default turn on code word would turn on the device after a full day of not receiving a system message, or STC update even if the device were in a low power (battery saving mode) or totally turned off. If the device is energized due to the default code word reaching zero, the device would stay on until a message directed to the device containing a new STC is received, even if the device was turned off by the communication device user. This device code word would guarantee, that no communication device in system 100 would lose synchronization with the system 100.
In summary, the present invention provides for an effective way of guaranteeing that communication units (106 and 108) in a communication system are turned on in order to guarantee the reception of system messages. The use of a STC code allows all of the pagers in a system to be time synchronized with the control terminal 104, either individually, as a group, or as an overall system. Utilizing an STC is more effective than the prior art method of relying on a real time clock stored in the radios to energize the communication devices at predetermined periods of time, since in modern wide area systems different units may be in different time zones, or the real time clocks in each of the units (106 and 108) may have been set incorrectly by the users. By making the system 100, via paging terminal 104 in control of the turn on time of the communication devices, the system 100 guarantees that important system messages are not missed. By updating the STC any time a device receives a message, increases the accuracy of the turn on time of the individual communication devices, without overly increasing the system transmission overhead times.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US3937004 *||May 24, 1974||Feb 10, 1976||Citizen Watch Co., Ltd.||Portable miniature type information treating device|
|US4194153 *||Sep 14, 1978||Mar 18, 1980||Nippon Electric Co., Ltd.||Digital radio paging communication system|
|US4398192 *||Dec 4, 1981||Aug 9, 1983||Motorola Inc.||Battery-saving arrangement for pagers|
|US4449248 *||Feb 1, 1982||May 15, 1984||General Electric Company||Battery saving radio circuit and system|
|US4523332 *||Apr 11, 1983||Jun 11, 1985||Nec Corporation||Battery saver circuit for use with paging receiver|
|US4745408 *||Apr 6, 1984||May 17, 1988||Nec Corporation||Radio paging system and receiver therefor|
|US4860005 *||Jan 7, 1988||Aug 22, 1989||Motorola, Inc.||Communication receiver with automatic turn on/off|
|GB2136616A *||Title not available|
|JPH02162842A *||Title not available|
|JPH03286632A *||Title not available|
|JPS649927A *||Title not available|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US5515043 *||Aug 17, 1994||May 7, 1996||Berard; Alfredo J.||Cellular/GPS system for vehicle tracking|
|US5553315 *||Nov 8, 1994||Sep 3, 1996||Motorola, Inc.||Method of maintaining access authorization using a bulletin board communication resource|
|US5590396 *||Apr 20, 1994||Dec 31, 1996||Ericsson Inc.||Method and apparatus for a deep-sleep mode in a digital cellular communication system|
|US5745860 *||Dec 16, 1994||Apr 28, 1998||Telefonaktiebolaget Lm Ericsson||Method and system of data transmission and reception in a mobile station within a radio telecommunications system|
|US5752202 *||Jan 30, 1997||May 12, 1998||Motorola, Inc.||Method of message delivery adapted for a power conservation system|
|US5832366 *||Jun 12, 1996||Nov 3, 1998||Nec Corporation||Radio selective call receiver|
|US5859595 *||Oct 31, 1996||Jan 12, 1999||Spectracom Corporation||System for providing paging receivers with accurate time of day information|
|US5905694 *||Jul 30, 1996||May 18, 1999||Rothberg; Michael R.||Coordinated presentation apparatus and method|
|US5987338 *||Feb 19, 1997||Nov 16, 1999||At&T Wireless Services||Remote wireless unit having reduced power operating mode|
|US6085114 *||Feb 6, 1997||Jul 4, 2000||At&T Wireless Systems Inc.||Remote wireless unit having reduced power operating mode|
|US6088576 *||Jun 20, 1996||Jul 11, 2000||Nec Corporation||Receiver providing signal reception in power-off state|
|US6205343 *||May 28, 1996||Mar 20, 2001||Motorola, Inc.||Peak current reduction in a cordless telephone handset|
|US6346873 *||Jan 2, 1997||Feb 12, 2002||Canon Kabushiki Kaisha||Power saving in a contention and polling system communication system|
|US6347236 *||Feb 24, 1997||Feb 12, 2002||At&T Wireless Sevices, Inc.||Remote wireless unit having reduced power operating mode for a discrete multitone spread spectrum communications system|
|US6490443||Aug 31, 2000||Dec 3, 2002||Automated Business Companies||Communication and proximity authorization systems|
|US6571111 *||Aug 5, 1998||May 27, 2003||Compaq Computer Corporation||Method and apparatus for reducing battery power consumption of transceivers in a communications network using an external generated timing signal|
|US6639905||Sep 24, 1999||Oct 28, 2003||Nokia Mobile Phones Limited||Communication network|
|US6782039||May 8, 2003||Aug 24, 2004||At&T Wireless Services, Inc.||Vertical adaptive antenna array for a discrete multitone spread spectrum communications system|
|US6785300||Oct 17, 2002||Aug 31, 2004||At&T Wireless Services, Inc.||Delay compensation|
|US6826165||Apr 4, 2000||Nov 30, 2004||Broadcom Corporation||Radio frequency local area network|
|US6853629||Mar 7, 2003||Feb 8, 2005||Cingular Wireless Ii, Llc||Method for frequency division duplex communications|
|US6859135 *||Jun 5, 2000||Feb 22, 2005||Brig Barnum Elliott||System and method for conserving energy in wireless devices|
|US6864558||May 17, 2001||Mar 8, 2005||Broadcom Corporation||Layout technique for C3MOS inductive broadbanding|
|US6895450||Apr 16, 2002||May 17, 2005||Broadcom Corporation||Communication network having a plurality of bridging nodes which transmit a beacon to terminal nodes in power saving state that it has messages awaiting delivery|
|US6897697||Aug 26, 2002||May 24, 2005||Broadcom Corporation||Current-controlled CMOS circuit using higher voltage supply in low voltage CMOS process|
|US6900670||May 9, 2002||May 31, 2005||Broadcom Corporation||Current-controlled CMOS logic family|
|US6909309||Dec 9, 2002||Jun 21, 2005||Broadcom Corporation||Current-controlled CMOS circuits with inductive broadbanding|
|US6911855||Jun 21, 2002||Jun 28, 2005||Broadcom Corporation||Current-controlled CMOS circuit using higher voltage supply in low voltage CMOS process|
|US6931555 *||Mar 21, 2001||Aug 16, 2005||At&T Laboratories Cambridge Limited||Power management system including a power controller for switching components to low or high power state based on signals received from power modules|
|US6937080||May 9, 2002||Aug 30, 2005||Broadcom Corporation||Current-controlled CMOS logic family|
|US6959013||Sep 24, 1999||Oct 25, 2005||Nokia Mobile Phones Limited||Communication network|
|US6975668||Nov 15, 2001||Dec 13, 2005||Cingular Wireless Ii, Llc||Adaptive weight update method and system for a discrete multitone spread spectrum communications system|
|US6982583||Jun 25, 2004||Jan 3, 2006||Broadcom Corporation||Current-controlled CMOS circuit using higher voltage supply in low voltage CMOS process|
|US7061969||Jul 20, 2004||Jun 13, 2006||Cingular Wireless Ii, Llc||Vertical adaptive antenna array for a discrete multitone spread spectrum communication system|
|US7106781||Aug 3, 2001||Sep 12, 2006||Cingular Wireless Ii, Llc||Highly bandwidth-efficient communications|
|US7109799||Jul 11, 2003||Sep 19, 2006||Broadcom Corporation||Current-controlled CMOS wideband data amplifier circuits|
|US7110744||Jul 19, 2002||Sep 19, 2006||Automated Business Companies||Communication and proximity authorization systems|
|US7132727||May 18, 2004||Nov 7, 2006||Broadcom Corporation||Layout technique for C3MOS inductive broadbanding|
|US7135889||May 29, 2004||Nov 14, 2006||Broadcom Corporation||Universal single-ended parallel bus|
|US7149238||Apr 21, 2006||Dec 12, 2006||Cingular Wireless Ii, Llc||Highly bandwidth-efficient communications|
|US7362174||Dec 28, 2005||Apr 22, 2008||Broadcom Corporation||Current-controlled CMOS (C3MOS) wideband input data amplifier for reduced differential and common-mode reflection|
|US7389436||Aug 12, 2004||Jun 17, 2008||At&T Laboratories Cambridge Limited||Power management system|
|US7415548||Dec 9, 2004||Aug 19, 2008||Broadcom Corporation||Communication network having a plurality of bridging nodes which transmits a polling message with backward learning technique to determine communication pathway|
|US7457646||Jul 31, 2003||Nov 25, 2008||Broadcom Corporation||Radio frequency local area network|
|US7460561||Jul 19, 2004||Dec 2, 2008||Clearwire Corporation||Delay compensation|
|US7483397||Oct 15, 2004||Jan 27, 2009||Broadcom Corporation||Radio frequency local area network|
|US7552246||Sep 8, 2003||Jun 23, 2009||Broadcom Corporation||Communication network having a plurality of bridging nodes which transmit a beacon to terminal nodes in power saving state that it has messages awaiting delivery|
|US7557719 *||Jul 3, 2006||Jul 7, 2009||Smart Caregiver Corporation||Patient monitor pressure pad with effective date warning alarm|
|US7558557||May 25, 1999||Jul 7, 2009||Broadcom Corporation||Low-power messaging in a network supporting roaming terminals|
|US7590083||Jun 12, 2006||Sep 15, 2009||Transcore Link Logistics Corp.||Wireless packet data distributed communications system|
|US7598788||Dec 28, 2005||Oct 6, 2009||Broadcom Corporation||Current-controlled CMOS (C3MOS) fully differential integrated delay cell with variable delay and high bandwidth|
|US7598811||Dec 28, 2005||Oct 6, 2009||Broadcom Corporation||Current-controlled CMOS (C3MOS) fully differential integrated wideband amplifier/equalizer with adjustable gain and frequency response without additional power or loading|
|US7606287||Feb 6, 2003||Oct 20, 2009||Broadcom Corporation||Radio frequency communication network having adaptive communication parameters|
|US7606575||Jan 24, 2002||Oct 20, 2009||Broadcom Corporation||Remote radio data communication system with data rate switching|
|US7702733 *||Jun 17, 2004||Apr 20, 2010||Vulcan Portals Inc.||Low power email functionality for an electronic device|
|US7724057||Jan 30, 2009||May 25, 2010||Broadcom Corporation||Current-controlled CMOS logic family|
|US7826818||Sep 8, 2003||Nov 2, 2010||Broadcom Corporation||Network supporting roaming, sleeping terminals|
|US7849208||Feb 18, 2008||Dec 7, 2010||Broadcom Corporation||System and method for TCP offload|
|US7873343||May 19, 2009||Jan 18, 2011||Broadcom Corporation||Communication network terminal with sleep capability|
|US7899951||Aug 18, 2008||Mar 1, 2011||Broadcom Corporation||Communication network having a plurality of bridging nodes which transmits a polling message with backward learning technique to determine communication pathway|
|US7907577||May 13, 2002||Mar 15, 2011||Broadcom Corporation||Communication network providing wireless and hard-wired dynamic routing|
|US7912064||Aug 7, 2008||Mar 22, 2011||Broadcom Corporation||System and method for handling out-of-order frames|
|US7917145||Nov 25, 2008||Mar 29, 2011||Broadcom Corporation||Radio frequency local area network|
|US7919985||Feb 10, 2009||Apr 5, 2011||Broadcom Corporation||Current-controlled CMOS circuits with inductive broadbanding|
|US7929540||Feb 15, 2010||Apr 19, 2011||Broadcom Corporation||System and method for handling out-of-order frames|
|US7934021||Jun 8, 2009||Apr 26, 2011||Broadcom Corporation||System and method for network interfacing|
|US7983217||Aug 15, 2008||Jul 19, 2011||At&T Mobility Ii Llc||Method for frequency division duplex communications|
|US7996480||Mar 16, 2010||Aug 9, 2011||Vulcan Portals Inc.||Low power email functionality for an electronic device|
|US8090963||Feb 19, 2008||Jan 3, 2012||Research In Motion Limited||Automated power management of a peripheral device|
|US8116203||May 31, 2007||Feb 14, 2012||Broadcom Corporation||Multiple virtual channels for use in network devices|
|US8135016||Oct 8, 2007||Mar 13, 2012||Broadcom Corporation||System and method for identifying upper layer protocol message boundaries|
|US8180928||Jun 17, 2005||May 15, 2012||Broadcom Corporation||Method and system for supporting read operations with CRC for iSCSI and iSCSI chimney|
|US8299834||May 28, 2010||Oct 30, 2012||Broadcom Corporation||Current-controlled CMOS logic family|
|US8305990||May 26, 2011||Nov 6, 2012||At&T Mobility Ii Llc||Method for frequency division duplex communications|
|US8345689||Apr 12, 2010||Jan 1, 2013||Broadcom Corporation||System and method for identifying upper layer protocol message boundaries|
|US8402142||Dec 21, 2007||Mar 19, 2013||Broadcom Corporation||System and method for TCP/IP offload independent of bandwidth delay product|
|US8451863||Apr 12, 2010||May 28, 2013||Broadcom Corporation||System and method for identifying upper layer protocol message boundaries|
|US8493857||Jan 14, 2011||Jul 23, 2013||Broadcom Corporation||Multiple logical channels for use in network devices|
|US8509260||Feb 26, 2004||Aug 13, 2013||Broadcom Corporation||Modular, portable data processing terminal for use in a communication network|
|US8549152||Jun 10, 2010||Oct 1, 2013||Broadcom Corporation||System and method for TCP/IP offload independent of bandwidth delay product|
|US8661272||Dec 14, 2011||Feb 25, 2014||Blackberry Limited||Automated power management of a peripheral device|
|US8677010||May 25, 2011||Mar 18, 2014||Broadcom Corporation||System and method for TCP offload|
|US8693432||Oct 30, 2012||Apr 8, 2014||At&T Mobility Ii Llc||Method for frequency division duplex communications|
|US8699988||Aug 20, 2009||Apr 15, 2014||Huawei Technologies Co., Ltd.||Method, device and system for sending and receiving messages|
|US8750320||Jan 21, 2003||Jun 10, 2014||Broadcom Corporation||Fibre channel arbitrated loop bufferless switch circuitry to increase bandwidth without significant increase in cost|
|US8767756||Nov 19, 2008||Jul 1, 2014||Broadcom Corporation||Fibre channel arbitrated loop bufferless switch circuitry to increase bandwidth without significant increase in cost|
|US8774199||Jan 21, 2003||Jul 8, 2014||Broadcom Corporation||Fibre channel arbitrated loop bufferless switch circuitry to increase bandwidth without significant increase in cost|
|US8798091||Apr 30, 2008||Aug 5, 2014||Broadcom Corporation|
|US8823435||Oct 17, 2012||Sep 2, 2014||Broadcom Corporation||Current-controlled CMOS logic family|
|US8903349 *||Nov 24, 2011||Dec 2, 2014||Telefonaktiebolaget L M Ericsson (Publ)||Receiver apparatus and method|
|US8954766||Apr 19, 2013||Feb 10, 2015||Blackberry Limited||Automated power management of a peripheral device|
|US8958440||May 28, 2013||Feb 17, 2015||Broadcom Corporation||System and method for identifying upper layer protocol message boundaries|
|US8958846||Aug 23, 2006||Feb 17, 2015||Charles Freeny, III||Communication and proximity authorization systems|
|US8965328||Feb 20, 2014||Feb 24, 2015||Huawei Technologies Co., Ltd.||Method, device and system for sending and receiving messages|
|US9036643||Jul 16, 2013||May 19, 2015||Broadcom Corporation||Multiple logical channels for use in network devices|
|US9088388||Apr 7, 2014||Jul 21, 2015||At&T Mobility Ii Llc||Method for frequency division duplex communications|
|US9112487||May 21, 2010||Aug 18, 2015||Broadcom Corporation||Current-controlled CMOS logic family|
|US9374435||Oct 29, 2007||Jun 21, 2016||Blackberry Limited||System and method for using trigger events and a redirector flag to redirect messages|
|US20020026598 *||Mar 21, 2001||Feb 28, 2002||Osborn Paul Anthony||Power management system|
|US20020122465 *||Aug 3, 2001||Sep 5, 2002||Agee Brian G.||Highly bandwidth-efficient communications|
|US20020187779 *||Jul 19, 2002||Dec 12, 2002||Freeny Charles C.||Communication and proximity authorization systems|
|US20020188575 *||Aug 2, 2002||Dec 12, 2002||Freeny Charles C.||Advanced wireless phone system|
|US20030051080 *||Apr 16, 2002||Mar 13, 2003||Mahany Ronald L.||Radio frequency local area network|
|US20030078006 *||Jan 24, 2002||Apr 24, 2003||Mahany Ronald L.||Remote radio data communication system with data rate switching|
|US20030174764 *||Feb 6, 2003||Sep 18, 2003||Mahany Ronald L.||Radio frequency communication network having adaptive communication parameters|
|US20040023617 *||Jul 31, 2003||Feb 5, 2004||Mahany Ronald L.||Radio frequency local area network|
|US20040056717 *||Jul 11, 2003||Mar 25, 2004||Broadcom Corporation||Current-controlled CMOS wideband data amplifier circuits|
|US20040166895 *||Feb 26, 2004||Aug 26, 2004||Koenck Steven E.||Modular, portable data processing terminal for use in a communication network|
|US20040207040 *||May 18, 2004||Oct 21, 2004||Broadcom Corporation||Layout technique for C3MOS inductive broadbanding|
|US20040217777 *||May 29, 2004||Nov 4, 2004||Armond Hairapetian||Universal single-ended parallel bus|
|US20050010748 *||Aug 12, 2004||Jan 13, 2005||At&T Laboratories Cambridge Limited||Power management system|
|US20050037819 *||Aug 6, 2004||Feb 17, 2005||Adir Naor||Cellular telephone with automatic turn on and off function|
|US20050066006 *||Jun 17, 2004||Mar 24, 2005||Vulcan Portals Inc.||Low power email functionality for an electronic device|
|US20050078647 *||Oct 15, 2004||Apr 14, 2005||Meier Robert C.||Radio frequency local area network|
|US20050086399 *||Sep 8, 2003||Apr 21, 2005||Mahany Ronald L.||Radio frequency local area network|
|US20080046530 *||Oct 27, 2007||Feb 21, 2008||Research In Motion Limited||System and Method for Pushing Information from a Host System to a Mobile Data Communication Device|
|US20090046602 *||Aug 18, 2008||Feb 19, 2009||Broadcom Corporation||Radio frequency local area network|
|US20090172189 *||Jan 27, 2009||Jul 2, 2009||Broadcom Corporation||Radio frequency local area network|
|US20090210729 *||Feb 19, 2008||Aug 20, 2009||Research In Motion Limited||Automated Power Management of a Peripheral Device|
|US20090323589 *||Jun 23, 2009||Dec 31, 2009||Broadcom Corporation||Radio frequency local area network|
|US20100075627 *||Aug 20, 2009||Mar 25, 2010||Michael Roberts||Method, device and system for sending and receiving messages|
|US20100174796 *||Mar 16, 2010||Jul 8, 2010||Vulcan Portals Inc.||Low power email functionality for an electronic device|
|US20100225355 *||May 21, 2010||Sep 9, 2010||Broadcom Corporation||Current-controlled CMOS logic family|
|US20100237921 *||May 28, 2010||Sep 23, 2010||Broadcom Corporation||Current-controlled CMOS logic family|
|US20100250783 *||Jun 10, 2010||Sep 30, 2010||Uri Elzur||System and method for tcp/ip offload independent of bandwidth delay product|
|US20110110236 *||Jan 14, 2011||May 12, 2011||Shiri Kadambi||Multiple Logical Channels for Use in Network Devices|
|US20130237171 *||Nov 24, 2011||Sep 12, 2013||Telefonaktiebolaget L M Ericsson (Publ)||Receiver Apparatus and Method|
|CN1085012C *||Jun 13, 1996||May 15, 2002||日本电气株式会社||Radio selective calling receiver|
|EP0742676A2 *||May 3, 1996||Nov 13, 1996||Siemens Aktiengesellschaft||Method for message transmission from a mobile radio network to a radio subscriber|
|WO1995028811A1 *||Apr 18, 1995||Oct 26, 1995||Motorola Inc.||A method and apparatus having time dependent sleep modes|
|WO2000018151A1 *||Sep 17, 1999||Mar 30, 2000||Nokia Mobile Phones Limited||Communication network|
|WO2014071967A1 *||Nov 6, 2012||May 15, 2014||Nokia Solutions And Networks Oy||Method and apparatus for receiving timing information from a cell or network a less active mode|
|U.S. Classification||340/7.36, 340/7.21, 340/7.38, 455/343.4, 455/70, 340/7.41|
|International Classification||H04B1/40, H04W88/02, H04W52/02|
|Cooperative Classification||H04B1/40, H04W88/022, Y02B60/50, H04W52/0216|
|European Classification||H04W52/02T2A, H04B1/40|
|Feb 6, 1998||FPAY||Fee payment|
Year of fee payment: 4
|Apr 29, 2002||FPAY||Fee payment|
Year of fee payment: 8
|May 21, 2002||REMI||Maintenance fee reminder mailed|
|Apr 26, 2006||FPAY||Fee payment|
Year of fee payment: 12